leopard gecko getting thinner and she sleeps all day

- Sex: female
- Age & Weight: she is 7 years old and i have not been able to weigh her.
- How long have you owned your leo: I have owned my leopard gecko for 4 and a half years now
- Where was he/she obtained (ex. Pet store, breeder, wild caught, friend): we purchased her from a friend that did not want to care for her anymore, not due to any health problems.

A) Health/History
- How often do you handle your leo: i usually take out my leopard gecko once every other week.
- Is your leo acting any different today? If so how does he/she normally act which differs from now.: she has been losing a substantial amount of body fat and is tired all of the time. As well her appite has been very low. another thing that has happened recently is that her head is always tilted.
- Has he/she had any problems in the past, if so please describe.: she has not had any problems like this in the past, but we recently changed her flooring from sand to paper towel.

B) Fecals
- Describe (look any different than normal): her poops have been mainly liquid.
- When was the last time he/she went: she passes almost every day

C) Problem
- Please briefly describe the problem and how long it has been going on: She has not been interested in eating for over 2 months now. her head has recently been tilted for a few days now.

Housing:
A) Enclosure
- Size: 50cm x 25cm
- Type (ex. glass tank): glass terrarium
- Type of substrate: was on sand when problems occurred, moved to paper towel for temporary, then she is now on reptile carpet
- Hides, how many, what kind: warm hide, a smooth hallow half of a tree. A cold hide, a large rock that she sleeps on usually

B) Heating
- Heat source: heating pad on one side of the tank. a heating lamp above he tank.
- Cage temps (hot side, cool side): this could be a problem because I have not been able to measure it recently
- Method of regulating heat source: I am unsure of what this means
- What are you using to measure your temps: i used to use a thermometer before but it stopped working and we have not found a replacement.
- Do you have any lights (describe): A heating lamp above her enclosure on the warm side

C) Cage mates
- How many (males, females) no other pet inside of her cage
- Describe health, or previous problems: she has not had problems being alone, she was alone when we obtained her as well

Describe Diet:
A) Typical diet
- What you're feeding (how often, how much): we feed her 3-4 crickets every 3-4 days
- How are you feeding (hand fed, left in dish, ect): we let the crickets roam around in her cage, she hunts them down.

B) Supplements (describe how often)
- What vitamin/minerals are you using (list brands): I use Exo terra brand calcium
- What are you gut loading food with: calcium drink and food (both in one)

Images:

If you copy and fill out the survey here, it will help determine if her environment could be contributing to her issues:
http://geckoforums.net/f130-health-medications/70912.htm

Right off the bat, this is the wrong time of year for brumation, so that is not likely the cause. Her head being stuck in a tilted position is concerning though. That often can indicate a neurological problem or and infection that is impacting balance. A picture or two would also help.

So if you need any more additional information could you let me know. I really need answers about what is wrong.

Honestly, your gecko looks pretty bad off. If you want to have a chance of saving her, you will need to take her to a vet. Liquid feces sounds like parasites, but I have no idea what could all of the sudden cause a head tilt.

alright, I am unsure if my local vet is trained with lizards but i will be checking to see if it has details on their website

I have to agree that a vet is in order. If your local vet does not treat reptiles, perhaps they can recommend someone who does in the area.

Even with treatment, she may need some adjustments to her current setup.
* It's very important to be able to monitor the floor surface temperature on the warm side. It should be in the range of 88 - 92 F. The best way to measure is with an infrared temp gun or a digital temperature monitor with a probe that can be stuck flat on the floor.
* For hides, most people recommend having a humid hide to provide moisture for shedding and hydration. This could be especially important with your lighting, which could dry out the enclosure. You may be able to eliminate the heat lamp if your house is not very cool.
* Finally, for supplementation, leopard geckos also need D3 to be able to process calcium, so if you are only using pure calcium supplements with no D3 in the dust or gutload, you may need to dust with calcium + D3 once or twice a week to help her absorb calcium.

Here's a good caresheet that explains a simple setup for a leopard gecko:
Leopard Gecko Care Guide - Leopard Geckos For Sale - Quality Gecko Breeder - Fair Prices - Tremper - Bell - Rainwater - Giant - Mack Snow - Albino - Tangerine - Fattail

I'm seeing a lot of problems with your care so far. First of all, the heat pad needs to be underneath her tank, not on the side of it. Belly heat is extremely important, as it helps them digest their food. Without it, it could cause digestive problems. The heat pad needs to be plugged in to a thermostat. Plugging a heat pad directly into the wall can cause the heat pad to reach temperatures of up to 170 degrees, and can easily kill your gecko. You need a thermostat to keep the heat pad at around 90-95 degrees.
You say you're feeding your gecko 3-4 crickets every 3-4 days. This isn't enough for a leopard gecko! You need to give her as many crickets as she can eat in a 15 minute period, every other day. If she will only eat 3-4 crickets in one sitting, that's fine. But you need to be offering them every other day.
WHAT EVER SHE DOESNT EAT IN THAT 15 MINUTE PERIOD NEED TO BE REMOVED IMMEDIATELY. Leaving crickets in the tank if very dangerous! Crickets can and will begin to EAT your gecko, even if they have food of their own.

Another problem with leaving crickets in the tank (and I think this is what your geckos problem is) is that the crickets will eat your geckos poop, which causes parasites to infest the inside of the cricket, and then your gecko eats the cricket, which gives the parasite to the gecko.

So yes, I think your gecko has parasites, and needs to be taken to a vet immediately.

Could it be the sand to going into her digestive system a blocking a lot

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Yes, it could be, but your gecko is pretty close to death. At this point you really need a vet. Without one, I seriously doubt your gecko will live. Even with one, there is no guarantee. Sometimes they can be very hard to bring back from that state, especially if she's got parasites. =(

If I were you, I would fix your set up in the ways described by the other posters (except I don't agree leopard geckos have to be fed every other day), get a fecal sample, and go to the vet.